Flat grade share
- Portland Coastal Marathon Half Marathon
- 52.2% Favoured
Portland Coastal Marathon Half Marathon vs Two Tunnels Railway Races Half Marathon
A data-led head-to-head using sourced race facts and available derived figures under one published methodology.
Data current as ofPortland Coastal Marathon Half Marathon or Two Tunnels Railway Races Half Marathon — which comes out ahead?
Portland Coastal Marathon Half Marathon has the stronger available profile on flat grade share, course flatness and scenery score.
Route comparison snapshot
Portland Coastal Marathon Half Marathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 4.3% Favoured
- flat grade share
- 52.2% Favoured
- lower ascent
- 364 m
- climbing density
- 17.3 m/km
- net elevation
- 0 m
- maximum grade
- 33.5%
Two Tunnels Railway Races Half Marathon
- Mapped route
- Held
- Elevation profile
- Held
- course flatness
- 5.4%
- flat grade share
- 42.9%
- lower ascent
- 489 m
- climbing density
- 23.2 m/km
- net elevation
- 2 m
- maximum grade
- 18.1%
| Metric | Portland Coastal Marathon Half Marathon | Two Tunnels Railway Races Half Marathon |
|---|---|---|
| Flat grade share | 52.2% ✓ | 42.9% |
| GAP factor (% slower than flat) | 4.3% ✓ | 5.4% |
| Uphill share | 25.0% | 28.5% |
| Steep-up share | 9.2% | 14.9% |
| Downhill share | 22.7% | 28.6% |
| Total ascent (m) | 364 m | 489 m |
| Climbing density (m/km) | 17.3 m/km | 23.2 m/km |
| Longest climb length (m) | 1,160 m | 1,840 m |
| Longest climb gain (m) | 94 m | 110 m |
| Longest climb average grade | 8.1% | 6.0% |
| Total descent (m) | 363 m | 487 m |
| Net elevation (m) | 0 m | 2 m |
| Max absolute grade | 33.5% | 18.1% |
| Start elevation (m) | 0 m | 41 m |
| Finish elevation (m) | 0 m | 43 m |
| Value | Unavailable | 82/100 |
| Scenic score | 87/100 ✓ | 77/100 |
| Conditions | 78/100 ✓ | 62/100 |
| Entry fee (GBP) | Unavailable | £46 |
| Lowest modelled true cost (GBP) | Unavailable | £176 |
GAP factor (% slower than flat)
- Portland Coastal Marathon Half Marathon
- 4.3% Favoured
Uphill share
Steep-up share
Downhill share
Total ascent (m)
Climbing density (m/km)
Longest climb length (m)
Longest climb gain (m)
Longest climb average grade
Total descent (m)
Net elevation (m)
Max absolute grade
Start elevation (m)
Finish elevation (m)
Value
- Portland Coastal Marathon Half Marathon
- Unavailable
Scenic score
- Portland Coastal Marathon Half Marathon
- 87/100 Favoured
Conditions
- Portland Coastal Marathon Half Marathon
- 78/100 Favoured
Entry fee (GBP)
- Portland Coastal Marathon Half Marathon
- Unavailable
Lowest modelled true cost (GBP)
- Portland Coastal Marathon Half Marathon
- Unavailable
Only metrics available for at least one side are shown. A ✓ marks the better value for each metric (higher-is-better aware). Scores are out of 100 when available. Ascent, climbing density, max absolute grade and median finish describe course or field context and are not marked as better or worse.
Race facts that change the decision
| Fact | Portland Coastal Marathon Half Marathon | Two Tunnels Railway Races Half Marathon |
|---|---|---|
| Schedule | Exact race date not confirmed. Event weekend starts 2027-02-14 (legacy event-level date). | Exact race date not confirmed. Event weekend starts 2026-08-16 (legacy event-level date). |
| Location | Portland, South West | Bath, South West |
| Actual distance | 21.1 km | 21.1 km |
| raceindex.org mapped route held | Held | Held |
| raceindex.org elevation profile held | Held | Held |
| Course type | Laps | Unavailable |
| Surface | Coastal trail on the South West Coast Path (exposed limestone peninsula terrain). | Unavailable |
| Terrain | Trail | Trail |
| Scenery | Island, Coastal, Waterfront, City, Historic | Parkland, Countryside, Riverside, City, Historic, Forest |
| Atmosphere | Scenic Tour, Wilderness | Scenic Tour, Community |
| Total ascent | 364 m | 489 m |
| Climbing density | 17.3 m/km | 23.2 m/km |
| Total descent | 363 m | 487 m |
| Net elevation | 0 m | 2 m |
| Max absolute grade | 33.5% | 18.1% |
| Flat grade share | 52.2% | 42.9% |
| GAP factor | 4.3% | 5.4% |
| Entry model | Open | Open |
| Entry fee | Unavailable | £46 |
| Lowest modelled true cost | Unavailable | £176 |
| Cost model origin | Unavailable | National Average |
| Measured course | No | Unavailable |
Schedule
- Portland Coastal Marathon Half Marathon
Exact race date not confirmed. Event weekend starts 2027-02-14 (legacy event-level date).
- Two Tunnels Railway Races Half Marathon
Exact race date not confirmed. Event weekend starts 2026-08-16 (legacy event-level date).
Location
- Portland Coastal Marathon Half Marathon
- Portland, South West
- Two Tunnels Railway Races Half Marathon
- Bath, South West
Actual distance
- Portland Coastal Marathon Half Marathon
- 21.1 km
- Two Tunnels Railway Races Half Marathon
- 21.1 km
raceindex.org mapped route held
- Portland Coastal Marathon Half Marathon
- Held
- Two Tunnels Railway Races Half Marathon
- Held
raceindex.org elevation profile held
- Portland Coastal Marathon Half Marathon
- Held
- Two Tunnels Railway Races Half Marathon
- Held
Course type
- Portland Coastal Marathon Half Marathon
- Laps
- Two Tunnels Railway Races Half Marathon
- Unavailable
Surface
- Portland Coastal Marathon Half Marathon
- Coastal trail on the South West Coast Path (exposed limestone peninsula terrain).
- Two Tunnels Railway Races Half Marathon
- Unavailable
Terrain
- Portland Coastal Marathon Half Marathon
- Trail
- Two Tunnels Railway Races Half Marathon
- Trail
Scenery
- Portland Coastal Marathon Half Marathon
- Island, Coastal, Waterfront, City, Historic
- Two Tunnels Railway Races Half Marathon
- Parkland, Countryside, Riverside, City, Historic, Forest
Atmosphere
- Portland Coastal Marathon Half Marathon
- Scenic Tour, Wilderness
- Two Tunnels Railway Races Half Marathon
- Scenic Tour, Community
Total ascent
- Portland Coastal Marathon Half Marathon
- 364 m
- Two Tunnels Railway Races Half Marathon
- 489 m
Climbing density
- Portland Coastal Marathon Half Marathon
- 17.3 m/km
- Two Tunnels Railway Races Half Marathon
- 23.2 m/km
Total descent
- Portland Coastal Marathon Half Marathon
- 363 m
- Two Tunnels Railway Races Half Marathon
- 487 m
Net elevation
- Portland Coastal Marathon Half Marathon
- 0 m
- Two Tunnels Railway Races Half Marathon
- 2 m
Max absolute grade
- Portland Coastal Marathon Half Marathon
- 33.5%
- Two Tunnels Railway Races Half Marathon
- 18.1%
Flat grade share
- Portland Coastal Marathon Half Marathon
- 52.2%
- Two Tunnels Railway Races Half Marathon
- 42.9%
GAP factor
- Portland Coastal Marathon Half Marathon
- 4.3%
- Two Tunnels Railway Races Half Marathon
- 5.4%
Entry model
- Portland Coastal Marathon Half Marathon
- Open
- Two Tunnels Railway Races Half Marathon
- Open
Entry fee
- Portland Coastal Marathon Half Marathon
- Unavailable
- Two Tunnels Railway Races Half Marathon
- £46
Lowest modelled true cost
- Portland Coastal Marathon Half Marathon
- Unavailable
- Two Tunnels Railway Races Half Marathon
- £176
Cost model origin
- Portland Coastal Marathon Half Marathon
- Unavailable
- Two Tunnels Railway Races Half Marathon
- National Average
Measured course
- Portland Coastal Marathon Half Marathon
- No
- Two Tunnels Railway Races Half Marathon
- Unavailable
Facts are shown only when they exist in the sourced race record; Not held means no sourced value is held for that race.
Common questions
Which is flatter, Portland Coastal Marathon Half Marathon or Two Tunnels Railway Races Half Marathon?
Portland Coastal Marathon Half Marathon has the lower GAP factor, making it the flatter course on our route model and more favourable on gradient alone.